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    The main reason for scaling of vacuum pump is that the water quality and operating temperature of circulating water exceed a certain index. Among the water quality indexes, the hardness of water has the greatest influence. Therefore, it is necessary to reduce the hardness of water as much as possible and control the working temperature of circulating water to deal with the scaling problem of vacuum pump.

1. Hardness of circulating cooling water

    The operation process of circulating water in vacuum pump is extremely similar to that of boiler water in low pressure hot water boiler. Therefore, according to the water quality standard of hot water boiler to manage the water quality of vacuum pump can not only avoid the scaling of vacuum pump, but also avoid the corrosion of vacuum pump.

    Most of the circulating water systems of vacuum pumps are open circulation systems with high backwater rate. In the case that ion exchange equipment is not used for water treatment due to capital and other reasons, a softened water tank and a high-level water tank are generally used to supply water to the vacuum pump.

2. Temperature control of circulating cooling water

    From the above analysis, it can be seen that the difference between the water ring temperature in the vacuum pump and the water temperature in the softening pool is an important factor leading to scaling. Therefore, it is important to reduce the fouling rate and ensure the maximum cooling effect.

    Therefore, in the process of circulating cooling water operation, it is necessary to monitor the return water temperature and quantity of each pump to ensure the normal water supply of each pump and the rule that the return water temperature does not exceed 40 ℃. The water supply can be controlled by valves. If the return water temperature exceeds the rules, the low-temperature cold water or other cooling methods should be adopted to reduce the temperature of the softened water in the softening pool.

3. Wash the pump body regularly

    The water ring vacuum pump body drainage gate valve, in addition to the normal discharge of water in the pump, can also use the pump body running water pressure to wash the dust and water slag in the pump regularly during the operation process. On the one hand, it can avoid dust accumulation, on the other hand, it can also avoid water slag into scale.

    The scaling problem of vacuum pump has its complicated formation mechanism. The key to find out the correct preventive measures is to correctly analyze the water quality target and operation parameters. In addition to water temperature control and timing flushing pump, water treatment is the most important link to avoid scaling.